Burner



y 1934- G. s. THOMPSON ET AL ,960,685

BURNER Filed Oct. 26. 1931 I Zf A TTORNEYS Patented May 29, 1934 r I UNITED STATES PATENT QFFICE BURNER George S. Thompson and Walter G. Bagley, Pueblo, Colo., assignors to The Colorado Fuel and Iron Company, Denver, Colo.

Application October 26, 1931, Serial No. 571,182

6 Claims. (Cl. 110104) Our invention relates to burners, and particunozzle 25 having an externally projecting, threadlarly to burners adapted for use with pulverized d e d 6 or Conn t With a feeder for mixed coal. An important object of the invention is to p lv riz coal n ir. h nozzle i internally provide means for cooling the burner by secondary grooved at 27 to provide a W y for a Sliding,

5 ,1 fiat shank 28 of a deflector member 29. A set Another feature of the invention is the provi- Screw 30 011 the nozzle engages Sa d Sha sion of practical means for igniting the pulverized The nozzle has & bell-Shaped d 3 t at is out coal. An object is to provide electrical means for Off at one Side, to Provide a Side Opening 32,5110WI1 such ignition, without the use of oil, gas, or other in Figures 1 and pp this ut p0 t 0n, the

intermediary deflector carries a ridge or projection 33, shown A further bject is to provide means far keeping in section in Figure 1 and in plan (except th CO1- the spark terminals clean and cool, and to prevent nets) in Figure This projection deflects the t spark termintus from gumming mixed air and pulverized coal laterally from the Still other objects reside in details of construcpassage 34 (extending through the nozzle tion and in novel combinations and arrangements out through the Side Opening 32, toward the tips 70 f parts, which W111 appear in the course of the 22 and 23 of the electrodes to facilitate ignition of following description. In the drawing, like referthe 00311- ence characters designate imflar parts in t The end of the deflector is recessed for the reseveml views, ception of refractory material 35. A small Figure 1 is a longitudinal Section through amount of ash 36 has a tendency to accumulate 7 but-net embodying features of t present on this material during operation, but this is not vention, together with associated elements. objectionable for it p t cts the deflector.

Figure 2 is a section taken on the line 22 of The Operation of the foregoing is t t clear. Figure 1, Instead of having to rely on a burning bed of Figure 3 is a section taken on the line 3 3 of ooels, which may so out when the feed is out 1 80 Figure 1, as in the case of other mechanical coal feeders,

Referring more in det il to the drawing, th and having to re-build the fire, with the present reference character '7 designates fire brick forminvention the the is completely t Off When not ing a furnace wall. A metal shell 3 is fastened on needed, and started anew practically nsta ta ethe outer surface of the fire brick. The fire brick 0115151 Wh needed. 95 provides a chamber 9 having cylindrical and taper- The Chamber 9 provides an annular Secondary ing portions 10 and 11 respectively, Th u t air space around the nozzle. This secondary air opening of the tapering portion is indicated at 12. pp y 00018 the electrodes d nozzle, keeps the The cylindrical portion 10 of the chamber is electrodes from gummihg D, and blows t Spark closed by an asbestos plate 13. The plate 13 and into the pulverized 0021 ture. t

shell 8 are fastened to the fire brick wall by bolts 14 The DrOjeCtiOn 33 and Side p 32 are and nuts 15. Nipples 16 and 17 extending through Dortaht features in affording means for d y the asbestos plate are preferably used for a peep igniting the pulverized a tll e- The echole and a connection with a source of secondary ondary air also directs the coal mixture and the no air respectively. spark together into the furnace. 55

High voltage electrodes 18 and 19 (such as 12,000 It i l to be und r h h n y be volts) also pass through the asbestos plate. The made in the details of construction and arrangeelectrodes are offset within the chamber 10, as ments of the pa Without departing from the shown at 20 and 21. The electrodes have tips 22 spirit and scope of the invention. and 23 extending toward each other at the ends What we claim and desire to secure by Letters 16 of leg members 24. The offsets and bent ends Patent is: allow the electrodes to be separated a suificient 1. In a furnace, a nozzle for feeding fuel to the distance that particles of coal cannot lodge becombustion space thereof. an air-supply chamber tween the same and short circuit the electric having an outlet adjacent the discharge end of system. Since the bent ends 22 and 23, where the the nozzle, to provide t air required for 165 sparks are desired, are closest together, short bustion of the fuel, the nozzle being cutaway at its circuiting is improbable. The electrodes used in said discharge end, to provide a side opening comthe present invention are shown in our pending municating with the chamber, electrodes having application Serial No. 552,164. a spark gap in the chamber establishing a point 7 Centrally disposed within the chamber 9 is a of ignition opposite said opening, and a deflector within said nozzle effective to restrict the nozzle discharge, and having means within said nozzle and adjacent said opening to deflect fuel through the opening to the spark gap.

2. In a furnace, a nozzle for feeding fuel to the combustion space thereof, an air-supply chamber having an outlet adjacent the discharge end of the nozzle, to provide the air required for combustion of the fuel, the nozzle being cutaway at its said discharge end, to provide a side opening communicating with the chamber, electrodes having a spark gap in the chamber establishing a point of ignition opposite said opening, and a deflector directing the fuel through the discharge end of the nozzle toward the outlet of the air chamber, and the deflector having a projection opposite the side opening of the nozzle to deflect fuel through the opening to the spark gap.

3. In a furnace, a nozzle for feeding fuel to the combustion space thereof, an air-supply chamber having an outlet adjacent the discharge end of the nozzle, to provide the air required for combustion of the fuel, the nozzle being cutaway at its said discharge end, to provide a side opening communicating with the chamber, electrodes having a spark gap in the chamber establishing a point of ignition opposite said opening, and a deflector within said nozzle effective to restrict the nozzle discharge'and having means within said nozzle and adjacent said opening to deflect fuel through the opening to the spark gap, said nozzle having longitudinally extending internal grooves, and said deflector having a flat shank slidable in the grooves, said shank being effective to transversely divide said nozzle into two passages for delivery of fuel.

4. In a furnace, a nozzle for feeding fuel to the combustion space thereof, an air-supply chamber having an outlet adjacent the discharge end of the nozzle, to provide the air required for combustion of the fuel, the nozzle being cutaway at its said discharge end, to provide a side opening communicating with the chamber, electrodes having a spark gap in the chamber establishing a point of ignition opposite said opening, and a deflector within said nozzle effective to restrict the nozzle discharge and having means within said nozzle and adjacent said opening to deflect fuel through the opening to the spark gap, said deflectorhaving a'fiat shank extending interiorly of the nozzle and engaging its sides to divide its interior into two passages for delivery of fuel to the furnace.

5. In a furnace, a nozzle for feeding fuel to the combustion space thereof, an air-supply chamber having an outlet adjacent the discharge end of the nozzle, to provide the air required for combustion 'of the'fuel, the nozzle being cutaway at its saiddischarge end,--to provide a side opening communicating with the chamber, electrodes having a spark "gap in the chamber establishing a point of ignition'opposite said opening, and a deflector within said nozzle effective to restrict the nozzle discharge-and'"having means within said nozzle ing a fla'tshank'eiite'nding interiorly of thenozzle and engaging its sides to divide its interior into 'two passages fondelivery of fuel to the furnace, and means'cooperating with'said nozzle -to secure the shank in selected positions.

6. The combination'o'f a furnace wall providing a chamber having arestricted outlet, aconduit in the'chamber for supplying 'a mixture of pulveriz'e'd 'coal and air, the conduit being partially cut away at its periphery to provide a side opening adjacent said restricted outlet, a deflector in the conduit having projection adjacent said opening to direct aportion of-t hejmix ed coal and air through the side opening, and electrodes in the chamber having the spark gap opposite the side opening and adjacent the restricted outlet of said chamber. I I

G ORGE, s- T M WALTER G. BAGLEY. 

